Github user witgo commented on the pull request:
https://github.com/apache/spark/pull/1578#issuecomment-50232324
Here also should throw an `FetchFailedException `?
```scala
override def next(): (BlockId, Option[Iterator[Any]]) = {
resultsGotten += 1
val startFetchWait = System.currentTimeMillis()
val result = results.take()
val stopFetchWait = System.currentTimeMillis()
_fetchWaitTime += (stopFetchWait - startFetchWait)
if (!result.failed) bytesInFlight -= result.size
while (!fetchRequests.isEmpty &&
(bytesInFlight == 0 || bytesInFlight + fetchRequests.front.size <=
maxBytesInFlight)) {
sendRequest(fetchRequests.dequeue())
}
(result.blockId, if (result.failed) None else
Some(result.deserialize()))
}
```
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